Most of us are often concerned with dealing with the energy within our studios while forgetting sound generated from outside a room, which causes vibration traveling through solid material. How best can we ward off external interference?
I used that have that problem with a couple of my wireless speakers and I tried everything from creating a floating barrier between my wall and the neighbors wall (these were apartments) to anchoring the speakers in different positions. What actually helped was simply increasing the strength of the signal to the wireless receiver and moving the receiver slightly closer to the transmitter (moving them too close together creates other problems). It's not exactly soundproof, but the audio sounds much better.